Meagan Otten and Alvin Phanh
GPS devices are used by people for driving, walking and mountaineering, and navigation at sea.
- Only two satellites are needed
- Circles Intersect
- Can be rough and inaccurate
- Needs 3 satellites
- Except instead of circles intersecting, spheres or cones intersect
- More accurate
How a GPS Works:
GPS systems work using GPS Receivers, the devices which carry or mount in their vehicles and a network of GPS Satellites.
GPS Receivers use trilateration to calculate their position on Earth. Each GPS receiver has a catalog of satellites and their current positions. As the receiver detects radio waves from a satellite, it calculates the time taken for the signal to reach it. This enables the receiver to know how far it is from the satellite and, therefore, how far it is from a known position in space.
Social and Ethical Considerations:
- Can be stolen (Hardware)
- Someone can put a tracker on your vehicle\
- Can take you to the wrong place
- Out dated information
- Pets: microchip
- Elderly, Alzheimer's: shoes
- Kids/Teenagers: backpacks & cell phones
- Prisoners, Parolees